| 摘要 |
An overrun device comprises first and second drive members. The first drive member includes a plurality of ramped teeth engageable by similar teeth of a coupler mounted through helical splines to the second drive member. Engagement of these teeth in one direction causes a transmittal of the drive between the two members while driving in the opposite direction tends to separate the teeth because of the biasing effect of the helical splines. Another coupler is mounted on the second drive member for interlocking toothed engagement with the first coupler under the influence of a spring to disable the effect of the helical spline bias and retain engagement of the first set of teeth in either drive direction. Pressure fluid is utilized to disengage the second coupler and enable disengagement of the first set of teeth, effecting overrun. |
